Android Rating Bar Example

What is Rating Bar

A RatingBar is an extension of SeekBar and ProgressBar that shows a rating in stars. The user can touch/drag or use arrow keys to set the rating when using the default size RatingBa

In Android, you can use “android.widget.RatingBar” to display rating bar component in stars icon. The user is able to touch, drag or click on the stars to set the rating value easily.

Android RatingBar displays the rating in stars. Android RatingBar is the subclass of AbsSeekBar class.

The getRating() method of android RatingBar class returns the rating number

Lets create a project and use Rating bar

main.xml

1. <RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
2.     xmlns:tools="http://schemas.android.com/tools"  
3.     android:layout_width="match_parent"  
4.     android:layout_height="match_parent"  
5.     tools:context=".MainActivity" >  
6.   
7.     <RatingBar  
8.         android:id="@+id/ratingBar1"  
9.         android:layout_width="wrap_content"  
10.         android:layout_height="wrap_content"  
11.         android:layout_alignParentTop="true"  
12.         android:layout_centerHorizontal="true"  
13.         android:layout_marginTop="44dp" />  
14.   
15.     <Button  
16.         android:id="@+id/button1"  
17.         android:layout_width="wrap_content"  
18.         android:layout_height="wrap_content"  
19.         android:layout_alignLeft="@+id/ratingBar1"  
20.         android:layout_below="@+id/ratingBar1"  
21.         android:layout_marginLeft="92dp"  
22.         android:layout_marginTop="66dp"  
23.         android:text="submit" />  
24.   
25. </RelativeLayout>  

MainActivity.xml

1. public class MainActivity extends Activity {  
2.     RatingBar ratingbar1;  
3.     Button button;  
4.     @Override  
5.     protected void onCreate(Bundle savedInstanceState) {  
6.         super.onCreate(savedInstanceState);  
7.         setContentView(R.layout.activity_main);  
8.         addListenerOnButtonClick();  
9.     }  
10.   
11.     public void addListenerOnButtonClick(){  
12.         ratingbar1=(RatingBar)findViewById(R.id.ratingBar1);  
13.         button=(Button)findViewById(R.id.button1);  
14.         //Performing action on Button Click  
15.         button.setOnClickListener(new OnClickListener(){  
16.   
17.             @Override  
18.             public void onClick(View arg0) {  
19.                 //Getting the rating and displaying it on the toast  
20.                 String rating=String.valueOf(ratingbar1.getRating());  
21.                 Toast.makeText(getApplicationContext(), rating, Toast.LENGTH_LONG).show();  
22.             }  
23.               
24.         });  
25.     }  
26.     @Override  
27.     public boolean onCreateOptionsMenu(Menu menu) {  
28.         // Inflate the menu; this adds items to the action bar if it is present.  
29.         getMenuInflater().inflate(R.menu.activity_main, menu);  
30.         return true;  
31.     }  
32.   
33. }  

Now run the Project, you will see how rating bar works.

Animations in Android

Animations in Android

Animation in android is possible from many ways. In this chapter we will discuss one easy and widely used way of making animation called tweened animation.

Android provides a large number of classes and interface for the animation development. Most of the classes and interfaces are given in android.animation package.

Android Animation enables you to change the object property and behavior at run time. There are various ways to do animation in android.

Tween Animation

Tween Animation takes some parameters such as start value , end value, size , time duration , rotation angle e.t.c and perform the required animation on that object. It can be applied to any type of object. So in order to use this , android has provided us a class called Animation.

In order to perform animation in android , we are going to call a static function loadAnimation() of the class AnimationUtils. We are going to receive the result in an instance of Animation Object. Its syntax is as follows −

Animation animation = AnimationUtils.loadAnimation(getApplicationContext(), 
   R.anim.myanimation);

Tweened animations are commonly used to:
➤ Transition between Activities.
➤ Transition between layouts within an Activity.
➤ Transition between different content displayed within the same View.
➤ Provide user feedback such as:
➤ Indicating progress.
➤ ‘‘Shaking’’ an input box to indicate an incorrect or invalid data entry.

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If you are losing air in your tire, but can't find a nail/screw/hole: fill your tire full of air, take off your tire and get some dish soap and water. Bubbles will develop where ever there is a leak. If the hole is in the middle of the tire (like seen here) you can get it repaired for a few dollars. If it's on the sidewalls, you're not so lucky.

Use a bowl lightly coated with oil to swat at mosquito with
Perfectly cut cherry tomatoes all at once:

Pour a half a cup of baking soda and a cup of vinegar into a clogged drain. Once it stops foaming rinse down the sink and your drains will be clear. A cheap and environmentally friendly way to unclog a sink

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Edit Texts In Android


A EditText is an overlay over TextView that configures itself to be editable. It is the predefined subclass of TextView that includes rich editing capabilities.

A user interface element for entering and modifying text. When you define an edit text widget, you must specify the TextView_inputType attribute. For example, for plain text input set inputType to "text":

 <EditText
     android:id="@+id/plain_text_input"
     android:layout_height="wrap_content"
     android:layout_width="match_parent"
     android:inputType="text"/>

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What is Android Text View

A user interface element that displays text to the user.

 <LinearLayout
       xmlns:android="http://schemas.android.com/apk/res/android"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
    <TextView
        android:id="@+id/text_view_id"
        android:layout_height="wrap_content"
        android:layout_width="wrap_content"
        android:text="@string/hello" />
 </LinearLayout>

TextView textView = (TextView) findViewById(R.id.textView);
textView.setText("AbhiAndroid"); //set text for text view

Making Phone Call In Android

We can make  a call In Android.

We are able to make a phone call in android via intent. You need to write only three lines of code to make a phone call.

1. Intent callIntent = new Intent(Intent.ACTION_CALL);  
2. callIntent.setData(Uri.parse("tel:"+8802177690));//change the number  
3. startActivity(callIntent); 

Write the permission code in Android-Manifest.xml file

You need to write CALL_PHONE permission as given below:

1. <uses-permission android:name="android.permission.CALL_PHONE" />

Using BlueTooth in Android

Bluetooth is a way to send or receive data between two different devices. Android platform includes support for the Bluetooth framework that allows a device to wirelessly exchange data with other Bluetooth devices.

Android provides Bluetooth API to perform these different operations.

• Scan for other Bluetooth devices
• Get a list of paired devices
• Connect to other devices through service discovery

Android provides BluetoothAdapter class to communicate with Bluetooth. Create an object of this calling by calling the static method getDefaultAdapter(). Its syntax is given below.

private BluetoothAdapter BA;
BA = BluetoothAdapter.getDefaultAdapter();

In order to enable the Bluetooth of your device, call the intent with the following Bluetooth constant ACTION_REQUEST_ENABLE. Its syntax is.

Intent turnOn = new Intent(BluetoothAdapter.ACTION_REQUEST_ENABLE);
startActivityForResult(turnOn, 0);       

Apart from this constant, there are other constants provided the API , that supports different tasks. They are listed below

Android Image Slider Example

In this tutorial, we will create an android image slider using android view pager and CircleIndicator library.

Android image slider slides one entire screen to another screen. Image slider is created by ViewPager which is provided by support library. To implement image slider, you need to inherit ViewPager class which extends PagerAdapter




main.xml

1. <?xml version="1.0" encoding="utf-8"?>  
2. <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"  
3.     xmlns:tools="http://schemas.android.com/tools"  
4.     android:layout_width="fill_parent"  
5.     android:layout_height="fill_parent"  
6.     android:paddingBottom="@dimen/activity_vertical_margin"  
7.     android:paddingLeft="@dimen/activity_horizontal_margin"  
8.     android:paddingRight="@dimen/activity_horizontal_margin"  
9.     android:paddingTop="@dimen/activity_vertical_margin"  
10.     tools:context="com.example.test.imageslider.MainActivity">  
11.   
12.   
13.     <android.support.v4.view.ViewPager  
14.         android:id="@+id/viewPage"  
15.         android:layout_width="fill_parent"  
16.         android:layout_height="fill_parent" />  
17.   
18. </RelativeLayout> 

MainActivity

1. public class MainActivity extends AppCompatActivity {  
2.   
3.     @Override  
4.     protected void onCreate(Bundle savedInstanceState) {  
5.         super.onCreate(savedInstanceState);  
6.         setContentView(R.layout.main);  
7.   
8.         ViewPager mViewPager = (ViewPager) findViewById(R.id.viewPage);  
9.         ImageAdapter adapterView = new ImageAdapter(this);  
10.         mViewPager.setAdapter(adapterView);  
11.     }  
12. }  

ImageAdapter.java

1. public class ImageAdapter extends PagerAdapter{  
2.     Context mContext;  
3.   
4.     ImageAdapter(Context context) {  
5.         this.mContext = context;  
6.     }  
7.   
8.     @Override  
9.     public boolean isViewFromObject(View view, Object object) {  
10.         return view == ((ImageView) object);  
11.     }  
12.   
13.     private int[] sliderImageId = new int[]{  
14.             R.drawable.image1, R.drawable.image2, R.drawable.image3,R.drawable.image4, R.drawable.image5,  
15.     };  
16.   
17.     @Override  
18.     public Object instantiateItem(ViewGroup container, int position) {  
19.         ImageView imageView = new ImageView(mContext);  
20.         imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);  
21.         imageView.setImageResource(sliderImageId[position]);  
22.         ((ViewPager) container).addView(imageView, 0);  
23.         return imageView;  
24.     }  
25.   
26.     @Override  
27.     public void destroyItem(ViewGroup container, int position, Object object) {  
28.         ((ViewPager) container).removeView((ImageView) object);  
29.     }  
30.   
31.     @Override  
32.     public int getCount() {  
33.         return sliderImageId.length;  
34.     }  
35. }  

Android TextureView Example

A TextureView can be used to display a content stream. Such a content stream can for instance be a video or an OpenGL scene. The content stream can come from the application's process as well as a remote process.

If you want to display a live video stream or any content stream such as video or an OpenGL scene, you can use TextureView provided by android in order to do that.

In order to use TextureView, all you need to do is get its SurfaceTexture.The SurfaceTexture can then be used to render content. In order to do this, you just need to do instantiate an object of this class and implement SurfaceTextureListener interface. Its syntax is given below 

private TextureView myTexture;
public class MainActivity extends Activity implements SurfaceTextureListener{
   protected void onCreate(Bundle savedInstanceState) {
      myTexture = new TextureView(this);
      myTexture.setSurfaceTextureListener(this);
      setContentView(myTexture);
   }
}

@Override
public void onSurfaceTextureAvailable(SurfaceTexture arg0, int arg1, int arg2) {
}

@Override
public boolean onSurfaceTextureDestroyed(SurfaceTexture arg0) {
}

@Override
public void onSurfaceTextureSizeChanged(SurfaceTexture arg0, int arg1,int arg2) {
}

@Override
public void onSurfaceTextureUpdated(SurfaceTexture arg0) {
}

Sending SMS In Android

In Android, We can use SmsManager API  to send SMS's. In this tutorial, we shows you two basic examples to send SMS message.

SmsManager smsManager = SmsManager.getDefault();
smsManager.sendTextMessage("phoneNo", null, "sms message", null, null);

Intent sendIntent = new Intent(Intent.ACTION_VIEW);
sendIntent.putExtra("sms_body", "default content"); 
sendIntent.setType("vnd.android-dir/mms-sms");
startActivity(sendIntent);